
/*
** Lexical Analyzer
** See Copyright Notice in lua.h
*/

#ifndef llex_h
#define llex_h

#include "lobject.h"
#include "lzio.h"

#define FIRST_RESERVED	257

/* maximum length of a reserved word */
#define TOKEN_LEN	(sizeof("function")/sizeof(char))

/*
* WARNING: if you change the order of this enumeration,
* grep "ORDER RESERVED"
*/
enum RESERVED {
  /* terminal symbols denoted by reserved words */
  TK_AND = FIRST_RESERVED, TK_BREAK,
  TK_DO, TK_ELSE, TK_ELSEIF, TK_END, TK_FALSE, TK_FOR, TK_FUNCTION,
  TK_IF, TK_IN, TK_LOCAL, TK_NIL, TK_NOT, TK_OR, TK_REPEAT,
  TK_RETURN, TK_THEN, TK_TRUE, TK_UNTIL, TK_WHILE,
  /* other terminal symbols */
  TK_NAME, TK_CONCAT, TK_DOTS, TK_EQ, TK_GE, TK_LE, TK_NE, TK_NUMBER,
  TK_STRING, TK_EOS
};

/* number of reserved words */
#define NUM_RESERVED	(cast(int, TK_WHILE-FIRST_RESERVED+1))

typedef union {
  lua_Number r;
  TString *ts;
} SemInfo;                             /* semantics information */

typedef struct Token {
  int token;
  SemInfo seminfo;
} Token;

typedef struct LexState {
  int current;                         /* current character (charint) */
  int linenumber;                      /* input line counter */
  int lastline;                        /* line of last token `consumed' */
  Token t;                             /* current token */
  Token lookahead;                     /* look ahead token */
  struct FuncState *fs;                /* `FuncState' is private to the parser */
  struct lua_State *L;
  ZIO *z;                              /* input stream */
  Mbuffer *buff;                       /* buffer for tokens */
  TString *source;                     /* current source name */
  int nestlevel;                       /* level of nested non-terminals */
} LexState;

void luaX_init(lua_State * L);
void luaX_setinput(lua_State * L, LexState * LS, ZIO * z, TString * source);
int luaX_lex(LexState * LS, SemInfo * seminfo);
void luaX_checklimit(LexState * ls, int val, int limit, const char *msg);
void luaX_syntaxerror(LexState * ls, const char *s) __attribute__ ((noreturn));
void luaX_errorline(LexState * ls, const char *s, const char *token, int line) __attribute__ ((noreturn));
const char *luaX_token2str(LexState * ls, int token);

#endif

/*
 * Local Variables:
 * c-basic-offset: 2
 * indent-tabs-mode: nil
 * End:
 */
